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Grinding mills for paint production

Grinding mills for paints or pigments require special sealing systems, as these products are extremely abrasive. The grinding mills can be either vertical or horizontal. The grinding takes place in a closed chamber in which very hard pellets of various oxides, glass and silicates, among others, are added, which are agitated via an axle with “fingers” where the pellets collide and the required texture is achieved. These mills, both vertical and horizontal, have a pump with a mechanical seal which pumps the paint. This technology is used for the production of high-quality paints and varnishes. This mill grinds paint pigments,…


New industrial demands call for personalised services

Sealing is an essential requirement in order to guarantee the safety and efficiency of industrial machinery. Being aware of the relevance of sealing quality in equipment brings with it the imperative to opt for increasingly personalised approaches. As a result, at Lidering, in addition to providing a wide range of mechanical seals for industry, we also offer an extensive range of services related to sealing in the industrial field. Let’s tell you about them.   Lidering Catalogue of Services Our industry support services are aimed at both companies and manufacturers. They are all implemented in accordance with our commitment to…


LHE heat exchanger

Some mechanical seal applications involve working at high temperatures, either with respect to the fluid product, or when it is the secondary fluid or barrier fluid. In these cases, it is possible that, in order to control the process, a high thermal dissipation capacity is required. For those applications, Lidering has an advanced liquid refrigeration system, the LHE. This is a multi-tubular heat exchanger designed in accordance with API 682/ISO 21049 standards. They are often used for API 21, 22, 23 or 41 assemblies, with the barrier fluid flowing via the interior multi-tubular circuit, and a second refrigeration fluid, for…


The Dry Seals sealing system as a solution for the chemical industry

The chemical sector involves working with aggressive powdered substances, these substances erode fundamental parts that ensure the proper functioning of the equipment; these include screw conveyors, rotary valves and internal agitators. The abrasive nature of these substances is coupled with the difficulty of having to maintain a specific and suitable level of humidity for the vast majority of applications. This removes lubricating or coolant fluids of any nature from the equation, and this is where the Dry Seals come to the fore.   Which specific applications do we recommend the Dry Seals sealing system for? As we indicated above, the…


Dry Seals

  There are many applications that work with powdered or extremely viscous products which have no lubricant properties to permit the mechanical seal contact surfaces to function without immediately becoming worn.  Finding a sealing element that guarantees sealing without leaks and adds durability to applications of this type poses a difficult challenge.  Braided packing is often used, which gives rise to the disadvantages of this kind of element, such as inevitable leakage to a greater or lesser extent, the use of elements prone to wear such as sleeves to protect the shaft, frequent maintenance to replace the sleeves and change…


Dynamic pump test

  Our knowledge and experience in mounting mechanical seals has enabled us to go one step further by being able to repair and improve the behaviour of pumps. At our facilities in Tarragona, we analyse pumping equipment behaviour and failures, and determine the most appropriate type of mechanical seal.     The main problems we usually find in the pumps we have to repair are: Leaks: they are the cause of half the problems we encounter that require improvement, according to statistics. In the case of aggressive chemicals, these leaks may pose a danger to people and to the environment….


Rotary Seals

Rotary seals are systems that are used to seal unions between fixed and rotating elements.     They basically consist of a connection guide element, a graphite bearing or bushing and a mechanical seal to seal the union. There are rotary seals for water, steam, oil and many other applications.     They usually function by letting the fluid to be sealed pass through the rotary connection, which is known as a one-way rotary seal. There are also seals that permit the fluids to pass through in both directions, without the incoming fluid being mixed with the outgoing fluid. This…


Concentrates for the food industry

  The food concentrates industry is one of the most powerful sectors in Southern Europe. There are many plants dedicated to manufacturing concentrated products such as tomato, citrus fruit, milk, sweets, alcoholic beverages and aromatic essences, among others. The concentrate production process consists basically of eliminate the water presence in the raw material to obtain a product with extremely intense properties. At the same time, their volume and weight are reduced by more than 90%, which facilitates their transportation and storage. What is more, concentrated products can be stored for long periods of time without spoiling and without their properties…


LDC82 and LDC83 cartridge seals

As we already saw in previous blog entries, agitators/reactors are a very special type of machine that is usually involved in the main processes of many facilities. This type of system requires mechanical seals that provide the highest level of service. In some cases, apart from the usual requirements for agitators to be able to operate in dry conditions, at high temperatures and with axial/tangential force, there are other, more demanding requirements such as being in contact with extremely aggressive chemicals or abrasive substances. The agitators that operate under these conditions usually have enamel-coated interiors and they are known as…



Agitators are of the most common industrial systems. They can be used in practically any sector, with the chemical and food industries being those in which this type of machinery is used most. There are many agitator/mixer designs with a greater or lesser degree of complexity, but they all have a common basic concept; they are used in tanks or similar devices into which different substances are poured and stirred using a rotating paddle system to mix them. Reactions usually occur between the added products, and for this reason these mixtures/reactions must remain under controlled pressure and/or temperature conditions. Again,…